R3C8 can only be <6>
R4C1 can only be <3>
R4C9 can only be <1>
R5C4 can only be <8>
R6C9 can only be <5>
R7C9 can only be <9>
R9C8 can only be <7>
R4C3 can only be <9>
R4C6 can only be <2>
R2C6 can only be <3>
R4C7 can only be <6>
R5C3 can only be <7>
R6C4 can only be <6>
R6C7 can only be <7>
R6C1 can only be <4>
R6C3 can only be <8>
R5C7 can only be <2>
R3C9 can only be <3>
R7C8 can only be <2>
R5C6 can only be <5>
R1C5 can only be <9>
R3C7 can only be <9>
R9C9 can only be <8>
R5C5 can only be <3>
R8C6 can only be <7>
R9C6 can only be <4>
R7C1 can only be <7>
R7C3 can only be <6>
R8C8 can only be <1>
R8C2 can only be <3>
R8C4 can only be <9>
R2C8 can only be <5>
R9C7 can only be <3>
R2C5 can only be <2>
R8C5 can only be <5>
R2C4 can only be <1>
R1C4 can only be <7>
R3C2 can only be <7>
R2C7 can only be <8>
R7C2 can only be <4>
R1C1 can only be <5>
R3C1 can only be <2>
R9C3 can only be <5>
R8C3 can only be <2>
R9C5 can only be <6>
R1C3 can only be <3>
R1C2 can only be <8>
R2C2 can only be <9>
R1C7 can only be <1>